There are too many decisions that would take too long. Take last night for example, Debuchy's challenge looked like he got the ball from several different angles but even the ones that threw doubt on it were inconclusive as to whether he got a light touch on it, and Wilshere's as obvious as it was that they player must've been tripped, there actually wasn't much evidence of it in the replays, even if he did admit it at the end of the game. I remember everyone was calling Bale a diver after looking at the replays of a penalty he got against Scotland, because the replays didn't show the contact but after the game, Maloney apologised for making a stupid foul saying there was contact. I don't understand why people think adding in replays would lead to snap decisions after 15 seconds of replays unless they were still going to risk getting it wrong. In my opinion, if you add in technology it should be instant and near enough infallible, we already have pundits watching the same replays and disagreeing with eachother and I see no reason why video refs would be any different. Maybe it's Hot-spot we need to show contact rather than refs with replays